pool

A swimmer swims laps in Bronte Ocean Pool as a severe storm hits Sydney at Bronte Beach on October 13, 2014 in Sydney, Australia.

Ryan Pierse/Getty Images

A swimmer does laps in Bronte Ocean Pool as a severe storm hits Sydney at Bronte Beach on Monday in Australia.

Children play in the pool in front of Malaysia's landmark Petronas Twin Towers in Kuala Lumpur, Malaysia, Thursday, June 12, 2014.

Vincent Thian/AP

Children play in the pool in front of the Petronas Twin Towers in Kuala Lumpur, Malaysia

Luka, almost two-year-old male polar bear, swims in his new home at the zoo in Wuppertal, Germany. He was born in the Netherlands and is meant to be the play partner for female polar bear Anori who is the same age.

Roland Weihrauch/EPA

Luka, an almost two-year-old male polar bear, swims in his new home at the zoo in Wuppertal, Germany. Born in the Netherlands, Luka has moved to Germany to be a companion for female polar bear Anori, who is the same age.

A worker cleans up a pool inside the Tuanku Mizan Zainal Abidin mosque in Putrajay, Malaysia.

Samsul Said/Reuters

A worker cleans a pool inside the Tuanku Mizan Zainal Abidin mosque in Putrajay, Malaysia.

A man rides on a water chute at an Aqua arena in Mogyorod, near Budapest, as temperatures reach 38 degrees Celsius (100 degrees Fahrenheit) in Hungary, August 6, 2013.

Laszlo Balogh/Reuters

A man rides down a water chute at a water park in Mogyoród, near Budapest, as temperatures reach 38C in Hungary.

Competitors from Egypt practice their synchronised swimming team performance at the Saint Jordi arena in Barcelona prior to the world swimming championships...Egypt's team practice their synchronised swimming team performance ahead of the upcoming World Swimming Championships at the Sant Jordi arena in Barcelona, July 17, 2013. The World Swimming Championships will take place July 20 to August 4.

Albert Gea/Reuters

Egypt’s team practice their synchronised swimming team performance ahead of the upcoming World Swimming Championships at the Sant Jordi arena in Barcelona. The World Swimming Championships will take place July 20 to August 4.

A Free Syrian Army fighter dives into a swimming pool inside a house in the old city of Aleppo...A Free Syrian Army fighter dives into a swimming pool inside a house in the old city of Aleppo June 24, 2013.

Muzaffar Salman/Reuters

A Free Syrian Army fighter dives into a swimming pool inside a house in the old city of Aleppo, Syria, on Monday 

Schoolchildren watch as "Inuka",

Roslan Rahman/Getty Images

Schoolchildren watch as “Inuka”, a male polar bear, swims in its enclosure at the Singapore Zoo on Wednesday. The 22-year-old polar bear, the first one born in the tropics, moved into his new frozen tundra home on May 29 in a 2,700 sq m exhibit featuring climate controlled resting areas and an expanded pool

Guests of the Marina Bay Sands

Roslan Rahman/AFP

Guests of the Marina Bay Sands hotel in Singapore look over the city-state’s financial district from a rooftop swimming pool.